thats how 2 plants look in my tank. its causing light algae in my tank but very rapidly. I jsut scrubbed my tank and got most of it out, did a 25% water change as well. Looks a little better but its still there. Its on the plants. I went and got a Plecosomus tonight so maybe it will help manage some of the algae.
But I too would like for this to be identified and solved just like you.